CN103645375A - Power supply overrunning detection module without reference source - Google Patents
Power supply overrunning detection module without reference source Download PDFInfo
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- CN103645375A CN103645375A CN201310749068.5A CN201310749068A CN103645375A CN 103645375 A CN103645375 A CN 103645375A CN 201310749068 A CN201310749068 A CN 201310749068A CN 103645375 A CN103645375 A CN 103645375A
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Abstract
The invention discloses a power supply overrunning detection module without a reference source. The power supply overrunning detection module comprises an upper limit detection submodule and a lower limit detection submodule which are connected with a power supply, wherein the upper limit detection submodule and the lower limit detection module are the same and comprise voltage sampling circuits, voltage comparison circuits and power down protection program starting circuits; the input ends of the voltage sampling circuits are connected with the power supply, and the output ends of the voltage sampling circuits are electrically connected with the input ends of the voltage comparison circuits; the output ends of the voltage comparison circuits are electrically connected with the input ends of the power down protection program starting circuits; the output ends of the power down protection program starting circuits are electrically connected with a power down protection circuit of a system. According to the power supply overrunning detection module, a reference source chip is not used, so that the number of corresponding matched chips is reduced, and low failure rate is achieved; early warning signals for overvoltage and undervoltage are output to be used for starting a power down protection program. The power supply overrunning detection module has the advantages of strong universality, small volume, low loss and high reliability, and is particularly suitable for monitoring the state of a 24V power supply.
Description
Technical field
The present invention relates to a kind of be applied in that redundant power switches fast without the reference source voltage detection module that transfinites.
Background technology
Along with electron trade is more and more higher to the requirement of product stability, reliability, be that technical grade or the automated production peculiar to vessel of civilian level are no longer all that simple function realizes.Reliability, security are more and more subject to developer's attention.For electronic product, power supply is the source of life of whole electronic product, and the reliable and stable availability that determines electronic product of power supply can well solve this problem of power supply reliability so have the power supply processing circuit of handoff functionality.
In application and development in the past, when system is given each module for power supply, module is mostly isolated system power supply, can guarantee within the specific limits like this stable of rear end power supply, but under different environment and loading condition, system power supply can produce fluctuation, when fluctuating range surpasses insulating power supply designing requirement, load meeting work is undesired, does not even work.Can cause in this case the part service data of product to have little time to preserve or some control procedures are interrupted suddenly and cause the damage of external unit.
Summary of the invention
The present invention is a kind of voltage without reference source chip of the researching and developing detection module that transfinites in order to overcome the problems referred to above that prior art exists.This detection module that transfinites can regulate by changing the size of resistance value for different warning limit values; Do not use reference source chip, reduced corresponding support chip, there is lower malfunction and failure rate; Overvoltage and the output of under-voltage early warning signal, can be used for starting power down protection program.Have highly versatile, volume is little, low in energy consumption, and the advantage that reliability is high is particularly suitable for the status monitoring of 24V power supply.
To achieve these goals, the technical scheme that the present invention takes is: a kind of power supply without reference source detection module that transfinites, be characterized in, and comprise the upper limit detection sub-module and the lower limit detection sub-module that are connected with power supply; Described upper limit detection sub-module is identical with lower limit detection sub-module, respectively comprises a voltage sample circuit, a voltage comparator circuit and a power down protection program start-up circuit; The input end of described voltage sample circuit is connected with power supply, and the output terminal of this voltage sample circuit is electrically connected to the input end of described voltage comparator circuit; The output terminal of this voltage comparator circuit is electrically connected to the input end of described power down protection program start-up circuit; The output terminal of this power down protection program start-up circuit is electrically connected to the power-down protection circuit of system.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, the voltage sample circuit of described upper limit detection sub-module consists of buck diode D1 and sample resistance R1～R4, described lower limit detection sub-module voltage sample circuit consists of buck diode D2 and sample resistance R5～R8, wherein:
Through R1 and R2 dividing potential drop, obtain V1+; Through D1, R3 and R4 dividing potential drop, obtain V1-; V1+ is one group of associated voltage with V1-;
Through R5 and R6 dividing potential drop, obtain V2-; Through D2, R7 and R8 dividing potential drop, obtain V2+; V2+ is one group of associated voltage with V2-.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, described V1+ and V1-are for monitoring supply voltage value overpressure situation; Described V2+ and V2-are for monitoring supply voltage value undervoltage condition.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, described overvoltage and the computing formula of under-voltage value are as follows:
Wherein:
VCC is supply voltage;
V
1+and V
1-, V
2+and V
2-for real-time sampling value;
V
dfor diode forward conduction voltage drop voltage;
R1 ~ R8 is sample resistance.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein,
When
time, voltage comparator circuit output high level;
When
time, voltage comparator circuit output high level.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, the voltage comparator circuit described in two consists of an operational amplifier U1.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, described operational amplifier is LM339 chip.
Above-mentioned a kind of power supply without reference source detection module that transfinites, described main each of power down protection program start-up circuit consists of a coupling mechanism and two regulating resistances; Wherein: the power down protection program start-up circuit of described upper limit detection sub-module consists of a coupling mechanism U2 and two regulating resistance R11, R12, the power down protection program start-up circuit of described lower limit detection sub-module is become with two regulating resistance R13, R14 by a coupling mechanism U3.
Above-mentioned a kind of power supply without reference source detection module that transfinites, wherein, can regulate by changing the size of the resistance value of regulating resistance for different detection limit values, and computing formula is as follows:
Wherein:
V
the upper limitthe higher limit that may reach for supply voltage;
V
lower limitthe lower limit that may reach for supply voltage;
R12 and R14 are that I/O1 and the I/O2 of two photoisolators while guaranteeing circuit turn-on holds the resistance while being output as 0V, at least adopt 1K Ω.
Because the present invention has adopted above technical scheme, the technique effect of its generation is obvious:
1, because a kind of power supply without reference source of the present invention detection module that transfinites comprises a upper limit detection sub-module and the lower limit detection sub-module being connected with power supply; Described upper limit detection sub-module and lower limit detection sub-module respectively comprise voltage sample circuit, voltage comparator circuit and start power down protection program circuit, therefore without producing in addition a stable reference source, directly by supply voltage step-down and dividing potential drop.Same voltage source dividing potential drop compares with respect to relatively strengthening antijamming capability with reference source.Processor can read comparer by photoelectric isolating circuit and export, and starts power down process program, has met the insulation request of system and module.
2, by early warning voltage detecting, in power-off pre-treatment power down protection program, can effectively prevent that external unit from damaging or the loss of important information, improved the safe reliability of product.
3,, because reference source chip has certain requirement to input voltage, as used this module of reference source also power supply will be converted to the voltage that meets the requirement of reference source chip, reduce reliability.And the present invention provides reference source without power supply, therefore greatly improved the reliability of circuit.
Accompanying drawing explanation
Fig. 1 is the present invention without the transfinite system electrical block diagram of detection module of the power supply of reference source.
Fig. 2 is the present invention without the transfinite electrical schematic diagram of a kind of embodiment of detection module of the power supply of reference source, and wherein a is the electrical schematic diagram of upper limit detection sub-module; B is the electrical schematic diagram of lower limit detection sub-module.
Embodiment
Below so that the present invention is described in further detail in conjunction with the accompanying drawings and embodiments.
Refer to Fig. 1.A kind of power supply without reference source of the present invention detection module that transfinites; comprise the upper limit detection sub-module 1 and the lower limit detection sub-module 2 that are connected with power supply 100, the output terminal of this upper limit detection sub-module 1 and a lower limit detection sub-module 2 is electrically connected to the power-down protection circuit 201 of system 200.Described upper limit detection sub-module is identical with lower limit detection sub-module, succinct for making to describe, now take upper limit detection sub-module 1 and be explained in detail as example: described upper limit detection sub-module 1 comprises a voltage sample circuit 11, a voltage comparator circuit 12 and a power down protection program start-up circuit 13; The input end of described voltage sample circuit is connected with power supply, and the output terminal of this voltage sample circuit is electrically connected to the input end of described voltage comparator circuit; The output terminal of this voltage comparator circuit is electrically connected to the input end of described power down protection program start-up circuit; The output terminal of this power down protection program start-up circuit is electrically connected to the power-down protection circuit of system.
It is identical with the sampling theorem of the voltage sample circuit of lower voltage limit detection that the present invention transfinites without the power supply of reference source that the upper voltage limit of detection module detects, and is all to make same voltage source change out different magnitudes of voltage by diode saturation voltage drop and different dividing potential drop ratios.Voltage comparator circuit (for example comparer) carries out voltage ratio by different magnitudes of voltage, if wherein+terminal voltage value is greater than-holds, and voltage comparator circuit output VCC(point source magnitude of voltage), otherwise comparer output GND(0V).Finally by power down protection program start-up circuit (cubic light isolating device), the magnitude of voltage of comparer output is converted to luminous energy; make the rear end output result corresponding with front end of light isolation device; for example comparer is exported VCC; DVDD(5V is exported in light isolation device rear end); comparer output 0V, light isolation device rear end output 0V.Concrete outcome is as following table:
For example: upper voltage limit nominal value is 32V, lower voltage limit nominal value is 15V:
With a specific embodiment, further illustrate feature of the present invention and performance below.
Refer to Fig. 2, Fig. 2 is the present invention without the transfinite electrical schematic diagram of a kind of embodiment of detection module of the power supply of reference source, and wherein a is the electrical schematic diagram of upper limit detection sub-module; B is the electrical schematic diagram of lower limit detection sub-module.A kind of power supply without reference source of the present invention transfinites in detection module, the voltage sample circuit of described upper limit detection sub-module consists of buck diode D1 and sample resistance R1～R4, described lower limit detection sub-module voltage sample circuit consists of buck diode D2 and sample resistance R5～R8, wherein:
Through R1 and R2 dividing potential drop, obtain V1+; Through D1, R3 and R4 dividing potential drop, obtain V1-; V1+ is one group of associated voltage with V1-;
Through R5 and R6 dividing potential drop, obtain V2-; Through D2, R7 and R8 dividing potential drop, obtain V2+; V2+ is one group of associated voltage with V2-.
Wherein, described V1+ and V1-are for monitoring supply voltage value overpressure situation; Described V2+ and V2-are for monitoring supply voltage value undervoltage condition.V1+ and V1-, V2+ and V2-are real-time sampled values.
It is the diode of 0.7V that D1 in this circuit and D2 select forward conduction voltage drop.
First suppose that power supply normal working voltage is 24V, the power supply processing module working range of system is 9～36V, and it is 32V that over voltage alarm limit value is set, and undervoltage warning limit value is 15V.Described overvoltage and the computing formula of under-voltage value are as follows:
Wherein:
VCC is supply voltage;
V
1+and V
1-, V
2+and V
2-for real-time sampling value;
V
dfor diode forward conduction voltage drop voltage;
When mains voltage variations is during to the power supply over voltage alarm limit value of surpass setting or line under-voltage warning limit value, V
1+and V
1-difference, V
2+and V
2-difference can there is qualitative change, comparer output level is changed;
R1 ~ R8 is sample resistance.
When
time, voltage comparator circuit output high level;
When
time, voltage comparator circuit output high level.
Voltage comparator circuit of the present invention consists of an operational amplifier U1, for example adopt LM339 chip, the power supply voltage range of this chip is 5～36V, the VCC of our hypothesis is in the scope of 15V～32V, the power requirement that meets LM339, so power-supply fluctuation can not have influence on the normal work of LM339, the voltage request of input end is no more than 0.7VCC, because dividing potential drop ratio before is all less than 0.7, so input terminal voltage meets the requirement of LM339.
When
time, comparer Out1 exports high level;
When
time, comparer Out1 exports high level.
Suppose R3, R4, R7, R8 is fixing is all 1K Ω; Diode drop 0.7V, the computing formula of all the other resistance is as follows:
R2 =（0.5×VCC 0.35）KΩ，
R6 = （0.5×VCC – 0.35）KΩ，
R5 = （VCC – R6）KΩ，
Wherein R1 and R2 can zoom in or out by same ratio, and R5 and R6 also can zoom in or out by same ratio.According to the normal range of operation of 15V～32V, calculate R1=32.7K Ω, R2=31.3K Ω, R5=15.7K Ω, R6=14.3K Ω.
This circuit is output as out1 and out2, and within the scope of normal voltage, (15～32V) out1 and out2 output valve are VCC; During lower than 15V, out2 output valve becomes 0V, and out1 is output as VCC; During higher than 32V, out1 output valve becomes 0V, and out2 is output as VCC.
Main each of power down protection program start-up circuit of the present invention consists of a coupling mechanism and two regulating resistances; Wherein: described main each of power down protection program start-up circuit consists of a photoisolator, a current-limiting resistance and a pull-up resistor; Wherein: the power down protection program start-up circuit of described upper limit detection sub-module consists of a photoisolator U2 and a current-limiting resistance R11, a pull-up resistor R12, the power down protection program start-up circuit of described lower limit detection sub-module consists of a photoelectric isolating coupler U3 and current-limiting resistance two regulating resistance R13, a pull-up resistor R14.Described photoelectric isolating device U2 and the front end of U3 are controlled by voltage comparator circuit output out1 and out2.When the electric current I F1 of voltage comparator circuit output and IF2 are during in 5～15mA, I/O1 and I/O2 are output as 0V; When front end electric current I F1 and IF2 are less than 5mA, I/O1 and I/O2 are output as DVDD level.This Current Control is controlled by the change in voltage of out1 and out2.Resistance value that can be by calculating R11 and R13 is to meet this requirement, and computing formula is as follows:
V
the upper limitfor the higher limit symbol that supply voltage may reach, V
lower limitthe lower limit symbol that may reach for supply voltage (note: the supply voltage upper limit and lower limit are the maximal values that possible reach herein, not upper limit lower limit alarming value).
According to this formula, in the present embodiment, the value of R11 and R13 is respectively:
R12 and R14 at least adopt 1K Ω, for example, adopt 10K Ω, I/O1 and I/O2 output 0V while being used for guaranteeing front end conducting.
Take 24V system as example, and setting power supply normal range of operation is 15V ~ 32V, value: R1=32.7K Ω, R2=31.3K Ω, R3=R4=1K Ω, R5=15.7K Ω, R6=14.3K Ω, R7=R8=1K Ω, R9=R10=10K Ω, R11=R13=1.5K Ω, R12=R14=10K Ω;
When power supply surpasses 32V, I/O1 and I/O2 export respectively DVDD and 0V;
When power supply is between 15V～32V, I/O1 and I/O2 export 0V;
When power supply is during lower than 15V and higher than 9V, I/O1 and I/O2 export respectively 0V and DVDD;
Utilize these three kinds of level to change, the power-down protection circuit of system can judge when enter power down protection program by gathering level mode, also can use with door and export a road I/O signal to the external interrupt triggering power down protection program of processor.
The present invention's detection module that transfinites can regulate by changing the size of resistance value for different warning limit values; Without power supply, provide reference source, reduced corresponding support chip, there is lower malfunction and failure rate; Overvoltage and the output of under-voltage early warning signal, can be used for starting power down protection program.There is highly versatile, volume is little, low in energy consumption, reliability is high, is particularly suitable for the status monitoring of 24V power supply.
Claims (9)
1. without the power supply of the reference source detection module that transfinites, it is characterized in that, comprise the upper limit detection sub-module and the lower limit detection sub-module that are connected with power supply; Described upper limit detection sub-module is identical with lower limit detection sub-module, respectively comprises a voltage sample circuit, a voltage comparator circuit and a power down protection program start-up circuit; The input end of described voltage sample circuit is connected with power supply, and the output terminal of this voltage sample circuit is electrically connected to the input end of described voltage comparator circuit; The output terminal of this voltage comparator circuit is electrically connected to the input end of described power down protection program start-up circuit; The output terminal of this power down protection program start-up circuit is electrically connected to the power-down protection circuit of system.
2. a kind of power supply without reference source according to claim 1 detection module that transfinites, it is characterized in that, the voltage sample circuit of described upper limit detection sub-module consists of buck diode D1 and sample resistance R1～R4, described lower limit detection sub-module voltage sample circuit consists of buck diode D2 and sample resistance R5～R8, wherein:
Through R1 and R2 dividing potential drop, obtain V1+; Through D1, R3 and R4 dividing potential drop, obtain V1-; V1+ is one group of associated voltage with V1-;
Through R5 and R6 dividing potential drop, obtain V2-; Through D2, R7 and R8 dividing potential drop, obtain V2+; V2+ is one group of associated voltage with V2-.
3. a kind of power supply without reference source according to claim 1 detection module that transfinites, is characterized in that, described V1+ and V1-are for monitoring supply voltage value overpressure situation; Described V2+ and V2-are for monitoring supply voltage value undervoltage condition.
4. according to the detection module that transfinites of a kind of power supply without reference source described in claim 1～3 any one, it is characterized in that, described overvoltage and the computing formula of under-voltage value are as follows:
Wherein:
VCC is supply voltage;
V
1+and V
1-, V
2+and V
2-for real-time sampling value;
V
dfor diode forward conduction voltage drop voltage;
R1～R8 is sample resistance.
5. a kind of power supply without reference source according to claim 4 detection module that transfinites, is characterized in that,
When
time, voltage comparator circuit output high level;
When
time, voltage comparator circuit output high level.
6. a kind of power supply without reference source detection module that transfinites according to claim 1 or 5, is characterized in that, the voltage comparator circuit described in two consists of an operational amplifier U1.
7. a kind of power supply without reference source according to claim 6 detection module that transfinites, is characterized in that, described operational amplifier is LM339 chip.
8. a kind of power supply without reference source according to claim 1 detection module that transfinites, is characterized in that, described power down protection program start-up circuit main each by a photoisolator and, a current-limiting resistance and a pull-up resistor form; Wherein:
The power down protection program start-up circuit of described upper limit detection sub-module consists of a photoisolator U2 and a current-limiting resistance R11, a pull-up resistor R12, and the power down protection program start-up circuit of described lower limit detection sub-module consists of a photoelectric isolating coupler U3 and a current-limiting resistance R13, a pull-up resistor R14.
9. a kind of power supply without reference source according to claim 8 detection module that transfinites, is characterized in that, for different detection limit values, can regulate by changing the size of the resistance value of regulating resistance, and computing formula is as follows:
Wherein:
V
the upper limitthe higher limit that may reach for supply voltage;
V
lower limitthe lower limit that may reach for supply voltage;
R12 and R14 are that I/O1 and the I/O2 of two photoisolators while guaranteeing circuit turn-on holds the resistance while being output as 0V, at least adopt 1K Ω.
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| WO2018019097A1 (en) * | 2016-07-28 | 2018-02-01 | 中兴通讯股份有限公司 | Method and device for parsing alarm information |
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| CN110927438B (en) * | 2019-11-27 | 2021-10-08 | 萧县众科电磁检测有限公司 | Direct current power supply voltage out-of-limit indicating device |
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| CN103645375B (en) | 2016-08-10 |
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